Apparatus for treating tin-scrap.



No. 883,211. PATENTED MAR. s1, 1908.

M. 11111011. Y APPARATUS F011 TREATING 11N SGRAP.

APPLICATION FILED AUG. 2, 1907.

2 SHEETS-SHBET l.

all;

WMM/wwe PATENTED MAR. 3l, 1968.

M. LEITCH. l APPARATUS PUR HEATING TIN SCRAP.

PPLIUATION FILED AUG. 2, 1907.

2 SHEETS-SHEET 2.

@www4-zones Z da 7h citizen of the United States, residing at UNITED STATES PATENT oEEioE.

lNREDlTll LlSlTlll. Ol" SPRINGFIELD, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGN- MENTS. T() METAL PROCESS COMPANY, A CORPORATION Oli" NEW YORK.

L APPARATUS FOR TREATIN G TIN-SCRAP.

Specification of Letters Patent.

Patented March 31, 19048.

Application filed August 2, 1907. Serial No. 386,716.

To'a'll whom it may concern: Y

Be it known that I, MEREDITH LErroH, a

Springfield, county of Hampden, State of Massachusetts, have invented certain new and useful Improvements in Ap aratus for Treating Tin-Scrap, of which the ollowing is a full, clear, and exact description.

My invention relates to apparatus for treating tin scrap, and has for its object to `provide an apparatus suitable for treating tin scrap and similar materials whatever their form or condition.

- It further has for its object to provide an apparatus which will more completely separate the solder from the dirt which is carried along by thescrap so as to do away very largely with -the necessity of refining thedirt in order to recover thesolder.

It further has for its object to submit the scrap to a washing bath prior to the desoldering treatment,and to carry out other useful steps in'arriviiig at the desired result.

An embodiment of my invention is shown in the accompanying drawings, in which y Figure l is a longitudinal section of the ap- A p`ara-tus on the line'X Yoi `Fig. 3. Fig. 2 is a section'through the mechanical trap -at the right hand end of Fig; 1 on the line 1 `r1. 3 is an end view of the second section of Fig. 1 looking toward'the left. Fig. 4 isla cross section of the left hand portion of the cylinder. Fig. 5 is an enlarged detail. f Referring more particularly t'o the drawings, A, B, C, D, E and .F are cylindrical sections mounted so as to revolve on the same axis which is. inclined so that the right hand "end is slightly lower than the'left hand end,

v l the axis of the left end coinciding with the .40

horizontal line C. The sections A, B, C, D and E are -all provided with internal projjecting teeth G, therelbeing preferably. at east four series Aof suoli teeth in each section, as shown in F ign-4, and where the apparatus is of large size other additional series of teeth are preferablyadded, as shown .in dots in Fig. 4. lThe sections A, B, and E are all perforated,`the erforations extending entirely r". over Itheir cylindrical surfaces. These perfol rations are indicated at H, H', H2.

The erforations H in the section A are prefera ly about 1g inchesin diameter so as to siftout the larger ortions of dirt, sand, avel and the-like. H an( H in sections B and E are 'slightly Eig. f

`he perforations smaller, being about 11/16 in diameter. The lower part of this section B dips into a tank I, which is filled with water for thepurpose of subjecting the material to a washing process. The easily detachable dirt and arge Lportion ofthe labels, etc. is thus remove from the scrap. At the righthand end of the section B are provided two scoops y or lifters J, which, as the section B revolves, y

lifts the-material which comes into contact with them upward and dumps -them into the section C. The section C is slightly tapered in shape, the smaller end being toward the right. The taperis such, however, that the bottom portion slants downward toward the left, although the axis of the section has its left end inclined upward. vThis results in causing the water which is carried by the scrap or has been scoopedu by the scoops J to liow back to the'sectionylgv The material in all the sections, on account of the inclination of the axis, moves towards the right. After leaving-L` it'passes into the section D, which preferably 4expands slightly until it reaches -thesection E. The section E has its per,-

liorated interior embraced by two surrounding 'guides K', K, between which is an opening. -This opening is surrounded by a cylindrical chamber L and serves to catch and retain any solder which may have passed. through the holes H2 and dropped off the guides K. AAny dirt or paper which may have come with the solder intothe chamber L i floats on top of it, and as the chamber L becomes somewhat filled, sifts out two narrow slits some four or six inches long, M M as the structure revolves. The cylinders D and-E are covered with insulation N so as ,to retain heat within them. As the scrap passes t0 the right it reaches 4the section F, which is a mechanical gas trap, the permit the discharge of t e scrap at this point, but to prevent the free ingressof air urpose being to so that the sections D andE will be filled with a substantially deoxidized atmosphere produced in the manner hereinafter described. This trap has an inner chamber O formed bythe wall O which is the same' diameter as the internal diameter of the er-r forated wall of the section E. This wal O is provided with two openings P P, each of which is closed byl a pivoted flap valve'P. An outer cylindrical wall Q has two openings Q', andthe passages formed b the outer cylindrical walls Q and the wal O of the chamber O are closed by valves R when which at all times cuts off the passage froml those valves to theopening Q nearest to it. It will thus be seen that while this ap aratus discharges freely the material whicli flows through the openings P when they are in their l'owermost position, the free ingress of air through these openings P is at all times prevented.

Within thev section E mounted on the shaft T is a burner-head U. The shaft T is hollow, and is in addition provided with a i e U. Compressed air is forced through the hollow shaft and fuel oil is forced through the pipe U to the burner-head, which is of any suitable construction. The air and fuel are there mixed in proper proportions to produce substantially'complete combustion so that the products are free of carbon and oxygen. The burner-head is surrounded by a metal casing V mounted on the shaft and provided on its exterior with rojections V. The interior of this casing is ljined with lire brick or a refractory lining V2, and forms a combustion chamber. The exterior of the structure consisting of the sections A to F inclusive is provided with circular projections W, which rest upon pulleys mounted upon the shaft W driven at a slow 4speed by the driving pulley W2. The burner-head and casing B are driven at a rapid rate by the pulley rl. As before stated the axis of the f entire machine is inclined so as its right hand end is slightly lower than the horizontal (l. The angle of. inclination, however, is less than the angle of the sides of the section C to the axis. The projections W are in the form of circular rings to which the several sections are bolted, and thus constitute removable tracks which can be replaced in case they be-` come worn.

The operation of the apparatus is as follows: The material is fed into the section A through the opening C, and the dirt, gravel, etc. sifted out through the openings H, it then passes into the' section B where it is Washed in the tank I, the refuse which is de- I tached in this manner passing throu h the openings H; itthen asses througi the section C where it is dried somewhat, being subjected to the products of combustion moving 1n the opposite direction, the lwater which drips from the scrap flowing down the inclined sides of the section C, back to the section B; it then passes into the section D Where it is heated somewhat and then into the section E where it-isbrought into direct contact with the hot gases of combustion, In its course it is continually being raised by the' revolution of the structure, and permitted to fall through the air to the bottom of the cylinder. The space within the sections D and E, as well as in the other sections, therefore has scrap continually falling through it, and it is in an ideal condition to be subjected to' the hot blast. While in the section E, the solder is brought to such a heat that it melts andas it is dislodged from the sera passes through the perforations H2 to t e guides K into the chamber L. These guides slope toward the opening between them and assist in concentrating the particlesofsolder into globules which coalesce scrap reaches the right-hand end of the section E it comes into contact, during its fall, with the and the l1 e to violent-blows, tearing them apart, and also still further acts to dislodge globules of melted solder. When it reaches the section F it passes through the openings P and past the valves P and R, and finally is discharged through the openings Q. As before stated, the lighter materials, which are carried with the scrap and pass througi the openings H2, Heat upon the solder in the chamber L, and is siftcd out through the openings M. by the chamber L can be opened from time to time when thel ap aratus is stationary and the solder remove and also the lighter materials cleaned out.v

The system is closed at the right hand end except as the mechanical trap opens. to discharge the tin scrap land as before explained, while discharging the tin scrap is closed against the ingress of air. The result is that the right hand end of the structure, where the material is heated, is kept filled with a deoXidiZed atmosphere so that the tin is not attacked in any way,'but is preserved so as processes.

One of the advantages of this apparatus is that it is capable of treating thefscrap in an-y form, that is in the form of cans either whole, crushed or shredded, and is also capable of treating tin cuttings for the purpose of removing any foreign' matter adhering thereto. Such of the foreign matter as is not removed by the sifting and washing processes will be carbonized so as not to interfere with the subsequent detinning process. So far as the desoldering per se is concerned, the sections A and B and the functions which they perform can be omitted, best results are, however, obtained when the scrap is submitted to i the action of all the sections. The amount of air and gas passing through the openings Mis so slight as to be negligible.

What I claim is:

1. ln an apparatus for treating tin scrap, the combination of a revolving cylinder havi ing an opening at one end for receiving the material to be treated and a discharge openi ing at the other end sealed against the ingress i of atmospheric air, andA means located near i the discharge end of the cylinder for mainwhen they reachthe chamber L. vYAs Ythe' A closure M. is provided whererejections. V/ which subject cans' 1 Cir 2. In an apparatus for Atreating tinscrap, 4

the combination of a revolving cylinder having an opening at one end for receiving the material to be treated and a discharge opening at the other end sealed against the ingress of atmospheric air, and means located near the discharge end of the cylinder for maintaining a heated deoxidized atmosphere with-in said cylinder, the axis of said cylinder being lower at the discharge end than at the receiving end and a body having projections and located within said cylinder in the neighborhood of its discharge end, and means for rapidly revolving said body.

3. In apparatus for treating tin scrap, the'combination of a revolving cylinder having an opening at one end' for receiving the material to be treated and a discharge opening at the other end sealed against the ingress of atmospheric air, Vand means located near the discharge end of the cylinderfor maintaining a heated deoxidized atmosphere within said cylinder, the axis of said cylinder being lower at the discharge end than at the receiving end, said cylinder being provided with internal projections and a body having projections and located lvvithi said cylinder in the neighborhood of its disc ar e end, and means for rapidly revolving said ody.

4. In an apparatus for treating tin scrap, the combination of a revolving cylinder having an opening at one end lfor receiving the material to be treated and a discharge opening at the other end sealed against the ingress of atmospheric air, and means for maintaining a heated deoxidized atmosphere within said cylinder, the axis of said cylinder being approximately horizontal, a combustion chamber near the discharge end of said cylinder surrounded with projections and means for rapidly revolving said projections.

5. In an apparatus for treati tin scrap, the combination of a revolving cy `nder. having an opening at one end for receiving the material to be treated and a discharge opening at the other end sealed against the ingress of atmospheric air,v andmeans for maintaining a heated deoxidized atmosphere within said cylinder, the axis of said cylinder being lower at the dischargel end than at the receiving end7 said cylinder being provided with internal projections, a combustion chamber near the discharge end of said cylinder surrounded with projections and means for rapidly revolving said projections.

6. In an apparatus for treating tin scrap,

the combination of a revolving cylinder, and

ml ans for maintaining a heated deoxidized atmosphere'within said cylinder, the axis of said cylinder being approximately' horizontal, said cylinder having an inner perforated wall and an outer chamber for receiving the material discharged through the perforations of said wall. I j

7. In an apparatus for treating tin scrap', the combination of a revolving cylinder,` and means for maintaining a heated deoxidized atmosphere within said cylinder, the axis of said cylinder being approximately "horinenl tal, saldcylinder having an inner perforated Wall and an outer chamber for receiving the' material discharged through the perforations of said wall,said receivi chamber vhaving an opening for automatica y discharging 1the lighter materials that may-enter it.

8.V In an apparatus for treating tm scrap, the combination of a revolving cy inder hav- 'ing an opening at one end for receiving the material to be treated and a discharge' opening at the other end sealed against the ingress of atmospheric air', and means for maintaining a heated deoxidized atmosphere within said cylinder, the axis of said cylinder being approximately horizontal, said cylinder having an inner perforated wall and an outer chamber for receiving the material dischaged thr'gugh the perforations of said Wal 9. In an apparatus for treati tin scrap,

the combination o f a revolving cy inder, and means for maintaining a heated deoxidized.

atmosphere within said cylinder, the axis of said cylinder being approximately horizontal, said cylinder having an inner perforated wall and an outer chamber for receiving the material discharged through the perforations of said Wall, and slanting guidi rounding said perforated cylin er and discharging into said chamber.

10. In an apparatus for treating tin scrap, the combinatlon of a was cylinder and a desoldering cylinder having t eir axes in line and ap roximately I horizontal, the axis at the endp remote 'from the washing cylinder being slightly lower than at the other end, means for revolving said cylinders and means for maintaining a deoxldized atmospherel within the desoldering cylinder.

11. rI he combination of a Washing cylinder means surand a desoldering cylinder having their axes axis at the end remote from the washing cylinder being slightly lower than at the other end, means for revolving said cylinders and means for maintainin a deoxidized atmosphere within the deso dering cylinder, a tapered draining cylinder interposed. between the washing cylinder and the desoldering cylindensaid cylinder having its largest end opening into said washing' cylinder, and a sifting cylinder opening into the end of said washing cylinder which is remote from said draining cylinder. Y

13. The combination of a washing cylinder and a desoldering cylinder having their axes in line and approximately horizontal7 the axis at the end remote from the washing cylinder being slightly lower .than at the other end, means for revolving said cylinders and means for maintaining adeoxidized atmosphere within the desoldering cylinder, and a sifting cylinder opening into the end of said washing cylinder which is remote from said desoldering cylinder.

14. In an apparatus for treating tin scrap, the combination of' a cylinder, means for maintaining a heated deoxidized atmosphere within the same and a discharging trap having a circular passa e provided with an opening in the inner Wa l at one end thereof, and an opening in the outer wall at the other end thereof and two valves, the. first closing the opening in the inner wall when the second is open, and the second Closing the passage when the first is open.

MEREDITH LEITCH.

Witnesses: 1

' H. B. BROWNELL, LANGDO'N MOORE. 

